The purpose of this released exercise set is to provide easy access to released exercises from the National Assessment of Educational Progress (NAEP) third mathematics assessment, conducted in 1981-82. Documentation includes basic reference numbers, objective classifications National Assessment has found useful, timing and administration data for each age group, and scoring guides for open-ended items. Part 1 of the text briefly explains NAEP's assessment procedures and describes the documentation provided for the various kinds of exercises in the set. Part 2 describes rationales behind the development of the attitudinal and experience questions for the 1981-82 mathematics assessment. Part 3 describes the taxonomic and content classifications used to develop and report on cognitive exercises for the 1981-82 mathematics assessment. The remainder of the exercise set consists of copies of released exercises and documentation for each exercise. Attitudinal and experience exercises compose Appendix A, followed by cognitive exercises in Appendix B, and by data for cognitive exercises in Appendix C. (BW)